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Related Experiment Video

Updated: Jun 17, 2025

Identification of Plant Ice-binding Proteins Through Assessment of Ice-recrystallization Inhibition and Isolation Using Ice-affinity Purification
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Protein inclusion into ice can dissociate subunits.

Robert Eves1, Peter L Davies1

  • 1Department of Biomedical and Molecular Sciences, Queen's University, Kingston, Canada, K7L 3N6.

Protein Expression and Purification
|August 13, 2024
PubMed
Summary

Ice-affinity tags, using antifreeze proteins, can purify single-subunit proteins. However, these tags cause dissociation in multi-subunit proteins, limiting their application to simpler protein structures.

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Area of Science:

  • Biochemistry
  • Protein purification
  • Crystallography

Background:

  • Antifreeze proteins (AFPs) can incorporate into ice, enabling purification of proteins and solutes.
  • Covalently attached domains to AFPs are also drawn into ice, acting as ice-binding affinity tags.

Purpose of the Study:

  • To explore the utility of ice-affinity tags on multi-subunit protein complexes.
  • To determine if ice-affinity tags can be used for purifying multi-subunit proteins.

Main Methods:

  • Fusion proteins were constructed by attaching an ice-binding protein to multi-subunit protein complexes.
  • Ice recrystallization and overgrowth were induced to observe the behavior of the tagged complexes.
  • Protein distribution within the ice and solution was analyzed post-overgrowth.

Main Results:

  • Attachment of ice-binding tags to multi-subunit complexes resulted in significant dissociation of subunits during ice overgrowth.
  • The subunit directly attached to the ice-binding tag was enriched in the ice.
  • Other subunits were largely excluded from the ice, indicating complex disruption.

Conclusions:

  • Step growth of the advancing ice front exerts shearing forces that disrupt non-covalent protein-protein interactions within multi-subunit complexes.
  • The application of ice-affinity tags is effectively limited to single-subunit proteins due to dissociation issues in larger complexes.